US5382927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Band-pass filter having two looped-shaped electrodes
Assignee: Murata Manufacturing Co Ltd
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Filing: 1993-08-26
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Granted: 1995-01-17
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Expires: 2013-08-26
Abstract
Abstract Two coil electrode patterns are formed on one surface of a plate consisting of a dielectric material. These coil electrode patterns are formed in a loop shape, and are disposed so as to be magnetically coupled with each other. Input/output terminal patterns and earth terminal patterns are drawn out from the coil electrode patterns toward an edge portion of the plate. The input/output terminal pattern and the earth terminal pattern of one coil electrode pattern are disposed at a selected at a distance so as to provide a predetermined impedance. An earth electrode pattern is formed opposite portion of the coil electrode patterns with the plate between them. Earth terminal patterns are formed to the earth electrode pattern. The earth terminal patterns of the earth electrode pattern are connected to the earth terminal patterns of the coil electrode patterns. A trimming electrode may be formed for adjusting the passing band frequency of the band-pass filter optionally.
Inventors
- 👤 Hisatake Okamura
- 👤 Masahiro Kasahara
- 👤 Teruhisa Tsuru
- 👤 Tetsuo Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:06
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20381; H01P7/00; H01P7/08; H01P7/084; H03; H03H; H03H5/00; H03H5/003; H03H7/00; H03H7/01; H03H7/0115; H03H1/00; H03H2001/0021; H03H2001/0085
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
125 words
A band-pass filter comprising: two first electrodes formed in a non-spiral loop shape and disposed so as to be magnetically coupled with each other; a second electrode formed in a plane shape opposite said first electrodes; a plate comprising a dielectric material between said first electrodes and said second electrode; two earth terminals drawn out respectively from said two first electrodes toward an edge portion of said plate; two input/output terminals drawn out respectively from said two first electrodes toward the same said edge portion of said plate with a distance between said earth terminals and said input/output terminals providing a predetermined impedance; and a pair of second earth terminals drawn out from said second electrode toward the same said edge portion of said plate.
Claim 2
Dependent Claim
125 words
A band-pass filter comprising: two first electrodes formed in a non-spiral loop shape and disposed so as to be magnetically coupled with each other; a second electrode formed in a plane shape opposite said first electrodes; a plate comprising a dielectric material between said first electrodes and said second electrode; two earth terminals drawn out respectively from said two first electrodes toward an edge portion of said plate; two input/output terminals drawn out respectively from said two first electrodes toward the same said edge portion of said plate with a distance between said earth terminals and said input/output terminals providing a predetermined impedance; and a pair of second earth terminals drawn out from said second electrode toward the same said edge portion of said plate.
Claim 3
Dependent Claim
46 words
A band-pass filter according to claim 1, wherein an additional second electrode is formed on the opposite side of said first electrodes from the first-mentioned second electrode and an additional plate comprising a dielectric material is disposed between said first electrodes and said additional second electrode.
Claim 4
Dependent Claim
57 words
A band-pass filter according to claim 2, wherein said additional second electrode is divided into two sections having substantially the same shape which is larger than that of said first electrodes, and a further pair of second earth terminals are drawn out respectively from the two electrode sections toward the same said edge portion of said plates.
Claim 5
Dependent Claim
37 words
A band-pass filter according to claim 2, wherein between said first electrodes and at least one of said second electrodes, a pair of third electrodes having substantially the same loop shape as said first electrodes are formed.
Claim 6
Dependent Claim
50 words
A band-pass filter according to claim 3, wherein a further additional plate comprising dielectric material is disposed between said first electrodes and one of said second electrodes, and a pair of third electrodes having substantially the same loop shape as said first electrodes are formed on said further additional plate.
Claim 7
Dependent Claim
74 words
A band-pass filter according to claim 2, wherein a pair of trimming electrodes are formed in a loop shape and spaced a distance from one of said second electrodes on the opposite side of said one of said second electrodes from said first electrodes, with a plate comprising a dielectric material disposed between said trimming electrodes and said one of said second electrodes, and said trimming electrodes are connected respectively to said first electrodes.
Claim 8
Dependent Claim
36 words
A band-pass filter according to claim 2, wherein a plurality of strip-shaped trimming electrodes are formed within at least one of said second electrodes, and are connected to said at least one of said second electrodes.
Claim 9
Dependent Claim
18 words
A band-pass filter according to claim 1, wherein each of said first electrodes has a gap formed therein.
Claim 10
Dependent Claim
20 words
A band-pass filter according to claim 1, wherein each of said first electrodes is continuous, having no gap formed therein.
Claim 11
Dependent Claim
18 words
A band-pass filter according to claim 2, wherein each of said first electrodes has a gap formed therein.
Claim 12
Dependent Claim
20 words
A band-pass filter according to claim 2, wherein each of said first electrodes is continuous, having no gap formed therein.
Claim 13
Dependent Claim
18 words
A band-pass filter according to claim 6, wherein said trimming electrodes are formed in a closed loop shape.
Claim 14
Dependent Claim
18 words
A band-pass filter according to claim 6, wherein said trimming electrodes are formed in a partial loop shape.
Claim 15
Dependent Claim
27 words
A band-pass filter according to claim 7, wherein said strip-shaped trimming electrodes are defined by respective elongated cut-outs formed within said at least one of second electrodes.
Claim 16
Dependent Claim
126 words
A band-pass filter comprising: two first electrodes formed in a non-spiral loop shape and disposed so as to be magnetically coupled with each other; a second electrode formed in a plane shape opposite said first electrodes; a plate comprising a dielectric material and having a periphery being disposed between said first electrodes and said second electrode; two earth terminals drawn out respectively from said two first electrodes toward the periphery of said plate; two input/output terminals drawn out respectively from said two first electrodes toward the periphery of said plate, a distance along said periphery between said earth terminals and said input/output terminals providing a predetermined impedance; and a pair of second earth terminals drawn out from said second electrode toward said periphery of said plate.
Claim 17
Dependent Claim
126 words
A band-pass filter comprising: two first electrodes formed in a non-spiral loop shape and disposed so as to be magnetically coupled with each other; a second electrode formed in a plane shape opposite said first electrodes; a plate comprising a dielectric material and having a periphery being disposed between said first electrodes and said second electrode; two earth terminals drawn out respectively from said two first electrodes toward the periphery of said plate; two input/output terminals drawn out respectively from said two first electrodes toward the periphery of said plate, a distance along said periphery between said earth terminals and said input/output terminals providing a predetermined impedance; and a pair of second earth terminals drawn out from said second electrode toward said periphery of said plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-16 | 1998-07-18 | 1999-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-16 | 2002-07-18 | 2003-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-16 | 2006-07-18 | 2007-01-17 | $7700.00 | Window Closed / Lapsed |